{"id":61,"date":"2018-11-26T19:33:29","date_gmt":"2018-11-26T19:33:29","guid":{"rendered":"https:\/\/andybase.com\/?p=61"},"modified":"2018-11-27T14:29:48","modified_gmt":"2018-11-27T14:29:48","slug":"946-validate-stack-sequences","status":"publish","type":"post","link":"https:\/\/andybase.com\/?p=61","title":{"rendered":"946 Validate Stack Sequences"},"content":{"rendered":"\n<p>Link:&nbsp; <a href=\"https:\/\/leetcode.com\/problems\/validate-stack-sequences\/\">validate stack sequences<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thought<\/h2>\n\n\n\n<p>Its pretty straight forward, just stimulate a stack and push\/pop as the sequence shows.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Code<\/h2>\n\n\n\n<pre class=\"wp-block-syntaxhighlighter-code brush: python; notranslate\">class Solution(object):\n    def validateStackSequences(self, pushed, popped):\n        \"\"\"\n        :type pushed: List[int]\n        :type popped: List[int]\n        :rtype: bool\n        \"\"\"\n        stack = []\n        visited = set()\n        N = len(popped)\n        j = 0\n        for i in pushed:\n            stack.append(i)\n            while stack and stack[-1] == popped[j] and j &lt; N:\n                stack.pop()\n                j += 1\n        if stack:\n            return False\n        return True<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Runtime<\/h2>\n\n\n\n<p>Time: O(n)<\/p>\n\n\n\n<p>Space: O(n)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Link:&nbsp; validate stack sequences Thought Its pretty straight forward, just stimulate a stack and push\/pop as the sequence shows.&nbsp; Code [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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